<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <div id="app">
        <button @click="fn">切换显示隐藏</button>
        <h2 v-show="isShow">Hello World</h2>
    </div>

    <script src="./js/vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                isShow: true
            },
            methods: {
                fn() {
                    // Vue 让 methods 中所有方法的this指向 Vue实例对象
                    console.log('执行了fn', this)
                    this.isShow = !this.isShow
                }
            }
        })
    </script>

</body>

</html>